public IActionResult AddSportAttributeConfirmed(SportAttributesViewModel viewModel) { ViewBag.Title = "Sportmateriaal toevoegen"; if (ModelState.ContainsKey("NewAttribute.Sport") && ModelState.ContainsKey("NewAttribute.Hall")) { ModelState["NewAttribute.Sport"].ValidationState = ModelValidationState.Valid; ModelState["NewAttribute.Hall"].ValidationState = ModelValidationState.Valid; } if (!ModelState.IsValid) { viewModel.Sports = _sportAccess.GetSports(); return(View(viewModel)); } viewModel.NewAttribute.Hall = _complexAccess.GetHall(viewModel.SportHallId); viewModel.NewAttribute.Sport = _sportAccess.GetSport(viewModel.SportId); _complexAccess.AddSportAttribute(viewModel.NewAttribute); return(RedirectToAction("SportAttribute", viewModel)); }